View Full Version : IRS Fluid recommendations
For the older IRS differential, any fluid recommendations? Don’t track the car, just looking for a good quality fluid. Thanks
Bob Cowan
08-29-2025, 12:38 PM
I always used Royal Purple gear lube.
narly1
08-29-2025, 01:10 PM
218215
Its Bruce
08-29-2025, 02:15 PM
The question is not entirely answerable without knowing what specific differential is installed.
The question is not entirely answerable without knowing what specific differential is installed.
Good question, bought it installed. MK 3 IRS from 2012 so I believe is the old T bird version
CraigS
08-30-2025, 01:40 PM
Mobil 1 75-90 LS. The LS denotes that it already has limited slip additive in it.